CN107285592B - Two-stage serial heat pump sludge dryer - Google Patents
Two-stage serial heat pump sludge dryer Download PDFInfo
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- CN107285592B CN107285592B CN201710543835.5A CN201710543835A CN107285592B CN 107285592 B CN107285592 B CN 107285592B CN 201710543835 A CN201710543835 A CN 201710543835A CN 107285592 B CN107285592 B CN 107285592B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A kind of two-stage tandem type heat pump sludge drier, it involves a kind of sludge heat pump drying equipment, in order to solve the existing heat pump sludge drying technology can't raise the temperature of circulating air while reducing the circulating air humidity entering the drying chamber, dry the poor problem of dehumidification ability, energy efficiency low, it includes drying chamber, two-stage tandem type heat pump system, regenerator, cooling plant, blower and condensed water collect the discharge apparatus, first-order evaporator and second-order condenser are connected in series in the air circulation pipeline closed in the drier; hot end inlet air of the heat regenerator is sent from the outlet end of a filter in the drying chamber, hot end outlet air of the heat regenerator is sent to cooling equipment, cold end inlet air of the heat regenerator is sent from a primary evaporator, and cold end outlet air of the heat regenerator is sent to a secondary condenser; the air feeder is positioned below the secondary condenser and used for pressurizing the circulating air and then sending the pressurized circulating air to the drying chamber; the condensed water collecting and discharging device is positioned below the heat regenerator, the cooling equipment and the primary evaporator. The invention is used for drying sludge.
Description
Technical Field
The invention relates to sludge heat pump drying equipment, and belongs to the technical field of drying mechanical equipment.
Background
In the process of recycling the sludge in the water treatment process, the removal of water in the sludge is always a problem troubled by the industry, and a low-temperature thermal drying technology represented by a heat pump sludge drying technology is a better sludge treatment means, so that the volume of the sludge can be remarkably reduced, the product property is stable, no odor exists, and no pathogenic organisms exist; the sludge product after drying treatment has multiple purposes, can adapt the characteristics of the sludge to the requirements of wider treatment and disposal processes, and is a sludge treatment method which is worth popularizing.
The heat pump sludge drying technology is limited by the drying temperature, and the single machine capacity of the technology is still to be improved. At present, a conventional heat pump sludge drying device is usually improved only aiming at certain parts of a system, and is not greatly optimized from the perspective of the whole system, so that the single-machine capacity and the energy efficiency level of the heat pump sludge drying device cannot be effectively improved.
Disclosure of Invention
The invention provides a two-stage serial heat pump sludge dryer, which aims to solve the problems that the circulating air temperature cannot be increased while the circulating air humidity entering a drying chamber is reduced, the drying and dehumidifying capacity is poor and the energy efficiency is low in the conventional heat pump sludge drying technology.
A two-stage serial heat pump sludge dryer comprises a drying chamber, a two-stage serial heat pump system, a heat regenerator, a cooling device, a blower and a condensed water collecting and discharging device, wherein the two-stage serial heat pump system consists of a first-stage compressor, a first-stage evaporator, a second-stage condenser, a first-stage throttling valve, a second-stage throttling valve, an intermediate heat exchanger and a second-stage compressor; the two-stage serial heat pump system is connected together through an intermediate heat exchanger, a first-stage evaporator and a second-stage condenser are connected in series in an air circulation pipeline closed by the dryer, refrigerant of the first-stage heat pump system is changed into high-temperature high-pressure gas through a first-stage compressor, the high-temperature high-pressure gas is subjected to heat exchange through the intermediate heat exchanger and then enters a first-stage throttling valve to be changed into low-temperature low-pressure liquid, the low-temperature low-pressure liquid enters the first-stage evaporator, the refrigerant of the second-stage heat pump system is changed into high-temperature high-pressure gas through a second-stage; hot end inlet air of the heat regenerator is sent from the outlet end of a filter in the drying chamber, hot end outlet air of the heat regenerator is sent to cooling equipment, cold end inlet air of the heat regenerator is sent from a primary evaporator, and cold end outlet air of the heat regenerator is sent to a secondary condenser; the cooling equipment is positioned at the front end of the primary evaporator; the air feeder is positioned below the secondary condenser and used for pressurizing the circulating air and then sending the pressurized circulating air to the drying chamber, and the condensed water collecting and discharging device is positioned below the heat regenerator, the cooling equipment and the primary evaporator.
Furthermore, a feeding device in the drying chamber is a sludge forming machine, the conveying device is a plurality of vertically arranged conveying belts, the moving directions of the adjacent conveying belts are opposite, a discharging port is formed in the lower portion of the outer side of the drying chamber and used for discharging materials, and an air filter is arranged on the upper portion of the inner side of the drying chamber.
Further, the regenerator is an air-air heat exchanger.
Further, the cooling equipment mainly consists of an air-water heat exchanger and an open or closed cooling tower.
Furthermore, the condensed water collecting and discharging device consists of a water collecting tray and a condensed water pipe.
Compared with the prior art, the invention has the beneficial effects that:
according to the heat pump sludge dryer with the two stages connected in series, the moisture content in the circulating air is reduced by reducing the first-stage evaporation temperature, the temperature of the circulating air is increased by increasing the temperature of the second-stage condenser, precooling is performed on the circulating air in the system by using an outdoor natural cold source, and the heat recovery device is used in a matched manner, so that the drying and dehumidifying capacity of the system is remarkably improved, and the drying and dehumidifying capacity is improved by over 67%. Compared with the prior heat pump drying technology, such as a cascade heat pump drying system, the working process of the invention adopts closed circulation, the heat in the circulating air is recycled through the heat regenerator, the cold quantity in the outdoor air can be fully utilized, and the energy utilization efficiency of the system can be greatly improved; compared with other improvements, the invention can greatly improve the capacity and efficiency of equipment by providing a novel two-stage serial heat pump sludge dryer, such as arranging a plurality of evaporators and condensers to enhance heat exchange, introducing solar energy as a heat source and the like.
Drawings
Fig. 1 is a schematic structural diagram of a two-stage series heat pump sludge dryer according to an embodiment of the invention.
Detailed Description
The technical solution of the present invention is further described by the following embodiments with reference to the accompanying drawings.
As shown in fig. 1, the two-stage series heat pump sludge dryer includes: the system comprises a drying chamber 1, a two-stage series heat pump system 2, a heat regenerator 3, a cooling device 4, a blower 5 and a condensed water collecting and discharging device 6;
the two-stage serial heat pump system 2 consists of a first-stage compressor 2-1, a first-stage evaporator 2-2, a second-stage condenser 2-3, a first-stage throttling valve 2-4, a second-stage throttling valve 2-5, an intermediate heat exchanger 2-6 and a second-stage compressor 2-7, wherein the first-stage evaporator 2-2 and the second-stage condenser 2-3 are connected in series in an air circulation pipeline closed by a dryer, the two-stage serial heat pump system 2 is connected together through the intermediate heat exchanger 2-6, refrigerant of the first-stage serial heat pump system is changed into high-temperature high-pressure gas through the first-stage compressor 2-1, the high-temperature high-pressure gas is subjected to heat exchange through the intermediate heat exchanger 2-6 and then enters the first-stage throttling valve 2-4 to be changed into low-temperature low-pressure liquid and then enters the first-stage evaporator 2-2 5, the low-temperature low-pressure liquid is changed into gas to return to a secondary compressor 2-7 after entering an intermediate heat exchanger 2-6 for heat exchange; hot end inlet air of the heat regenerator 3 is sent from the outlet end of a filter 1-4 in the drying chamber 1, hot end outlet air of the heat regenerator 3 is sent to a cooling device 4, cold end inlet air of the heat regenerator 3 is sent from a primary evaporator 2-2, and cold end outlet air of the heat regenerator 3 is sent to a secondary condenser 2-3; the cooling device 4 is positioned at the front end of the primary evaporator 2-2; the blower 5 is positioned below the secondary condenser 2-3 and pressurizes the circulating air and then sends the pressurized circulating air into the drying chamber 1, and the condensed water collecting and discharging device 6 is positioned below the heat regenerator 3, the cooling device 4 and the primary evaporator 2-2.
The drying chamber 1 comprises a feeding device 1-1, a conveying device 1-2, a discharging device 1-3 and a filter 1-4; and the condensed water collecting and discharging device 6 is positioned below the cooling device 4 and the primary evaporator 2-2 of the heat pump and is used for collecting and discharging condensed water condensed in the heat regenerator 3, the cooling device 4 and the primary evaporator 2-2.
A feeding device 1-1 in a drying chamber 1 is a sludge forming machine, a conveying device 1-2 is a plurality of vertically arranged conveying belts, the moving directions of the adjacent conveying belts are opposite, a discharging hole is formed in the lower portion of the outer side of the drying chamber 1 and used for discharging dried sludge through a discharging device 1-3, and an air type filter 1-4 is arranged on the upper portion of the inner side of the drying chamber 1. The sludge is treated by the feeding device 1-1 and then changed into particles, the particles enter the drying chamber 1, the particles are contacted with drying air in the drying chamber 1 under the action of the conveying device 1-2, moisture of the particles is taken away by the air, and the particles finally fall into the discharging device 1-3 to be discharged after the drying is finished.
In order to improve the heat exchange efficiency, the heat regenerator 3 is an air-air heat exchanger and can discharge the condensed water inside thereof. In order to improve the heat exchange efficiency and enhance the heat exchange capacity, the cooling device 4 mainly comprises an air-water heat exchanger and an open or closed cooling tower.
For convenience of use, the condensed water collecting and discharging device 6 comprises a water collecting tray 6-1 and a condensed water pipe 6-2, the water collecting tray 6-1 is arranged below the heat regenerator 3, the cooling device 4 and the primary evaporator 2-2, and the condensed water pipe 6-2 is arranged at the bottom of the water collecting tray 6-1. Condensed water condensed in the heat regenerator 3, the cooling device 4 and the primary evaporator 2-2 is collected by the water collecting tray 6-1 and then is discharged through the water condensing pipe 6-2.
The working process is as follows: the whole sludge dryer operates in a closed state, a drying medium is air, dry hot air enters the drying chamber 1 under the action of the air feeder 5 and contacts with sludge, arrows in the figure 1 show the flowing trend of the air, the air is changed into damp hot air through temperature reduction and humidification, and meanwhile, moisture in the sludge is taken away. The wet hot air filters dust particles through the filters 1-4, enters the heat regenerator 3 to be cooled, dehumidified and separated to obtain partial condensed water, is precooled by the cooling equipment 4, is cooled and dehumidified again, is cooled, dehumidified and separated to obtain the condensed water through the primary evaporator 2-2 of the heat pump, and is changed into dry cold air, and the dry cold air enters the secondary condenser 2-3 to be heated and changed into dry hot air after being preheated by the heat regenerator 3, so that the circulation process is completed. The condensed water formed in the process is collected by the water collecting tray 6-1 and then discharged through the condensed water pipe 6-2.
On the side of the two-stage serial heat pump 2, refrigerant in the first-stage heat pump system passes through the first-stage compressor 2-1 and then is changed into high-temperature high-pressure gas, the high-temperature high-pressure gas enters the intermediate heat exchanger 2-6, and meanwhile, heat is dissipated to the refrigerant in the second-stage heat pump system. And then the refrigerant in the first-stage heat pump system is changed into low-temperature low-pressure liquid through a first-stage throttling valve 2-4 and then enters a first-stage evaporator 2-2, and the heat of the hot and humid air absorbed in the first-stage evaporator 2-2 is changed into gas which is compressed again by a first-stage compressor 2-1 to complete circulation. The refrigerant in the secondary heat pump system is changed into high-temperature and high-pressure gas after passing through a secondary compressor 2-7, enters a secondary condenser 2-3, and simultaneously dissipates heat to the preheated dry and cold air. Then the refrigerant is changed into low-temperature low-pressure liquid through a second-stage throttle valve 2-5, and then enters an intermediate heat exchanger 2-6 to absorb the heat of the refrigerant in the first-stage heat pump system, and the low-temperature low-pressure liquid is changed into gas which is compressed again by a second-stage compressor 2-7 to complete the circulation.
Meanwhile, the sludge is treated by the feeding device 1-1 and then changed into particles, the particles enter the drying chamber, the particles are contacted with the drying air in the drying chamber 1 under the action of the conveying device 1-2, the moisture of the particles is taken away by the air, and the particles finally fall into the discharging device 1-3 after the drying is finished.
It can be seen from the above operation process that the two-stage series heat pump 2 can reduce the temperature of the first-stage evaporator 2-2 to reduce the moisture content in the circulating air, and increase the temperature of the second-stage condenser 2-3 to increase the temperature of the circulating air, thereby significantly improving the drying and dehumidifying capacity of the system.
The above embodiments are intended to illustrate rather than limit the invention, and various changes and modifications may be made without departing from the spirit and principles of the invention, and all equivalent technical solutions are intended to fall within the scope of the invention.
Claims (3)
1. A two-stage serial heat pump sludge dryer comprises a drying chamber, a two-stage serial heat pump system, a heat regenerator, a cooling device, a blower and a condensed water collecting and discharging device, and is characterized in that the drying chamber is provided with a heat pump system and a heat pump system; the two-stage serial heat pump system mainly comprises a first-stage compressor, a first-stage evaporator, a second-stage condenser, a first-stage throttling valve, a second-stage throttling valve, an intermediate heat exchanger and a second-stage compressor; the primary evaporator and the secondary condenser are connected in series in an air circulation pipeline closed by the dryer; the two-stage serial heat pump systems are connected together through an intermediate heat exchanger, refrigerant of the first-stage heat pump system is changed into high-temperature high-pressure gas through a first-stage compressor, the high-temperature high-pressure gas is subjected to heat exchange through the intermediate heat exchanger, then the high-temperature high-pressure gas enters a first-stage throttling valve, the low-temperature low-pressure liquid enters a first-stage evaporator, the refrigerant of the second-stage heat pump system is changed into high-temperature high-pressure gas through a second-stage compressor, the high-temperature high-pressure gas;
hot end inlet air of the heat regenerator is sent from the outlet end of a filter in the drying chamber, hot end outlet air of the heat regenerator is sent to cooling equipment, cold end inlet air of the heat regenerator is sent from a primary evaporator, and cold end outlet air of the heat regenerator is sent to a secondary condenser; the cooling equipment is positioned at the front end of the primary evaporator; the air feeder is positioned below the secondary condenser and used for pressurizing circulating air and then sending the pressurized circulating air to the drying chamber, and the condensed water collecting and discharging device is positioned below the heat regenerator, the cooling equipment and the primary evaporator; the heat regenerator is an air-air heat exchanger; the cooling equipment mainly comprises an air-water heat exchanger and an open or closed cooling tower.
2. The two-stage series heat pump sludge dryer of claim 1, wherein: the feeding device in the drying chamber is a sludge forming machine, the conveying device is a plurality of vertically arranged conveying belts, the moving directions of the adjacent conveying belts are opposite, a discharging port is formed in the lower portion of the outer side of the drying chamber and used for discharging materials, and the air filter is arranged on the upper portion of the inner side of the drying chamber.
3. The two-stage series heat pump sludge dryer of claim 1 or 2, wherein: the condensed water collecting and discharging device comprises a water collecting tray and a water condensing pipe, the water collecting tray is arranged below the heat regenerator, the cooling equipment and the primary evaporator, and the water condensing pipe is arranged at the bottom of the water collecting tray.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710543835.5A CN107285592B (en) | 2017-07-05 | 2017-07-05 | Two-stage serial heat pump sludge dryer |
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| CN201710543835.5A CN107285592B (en) | 2017-07-05 | 2017-07-05 | Two-stage serial heat pump sludge dryer |
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| CN107285592B true CN107285592B (en) | 2020-09-22 |
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| CN107560344A (en) * | 2017-10-25 | 2018-01-09 | 宁波惠康实业有限公司 | The hot high-temperature pump dryer of Two-stage Compression |
| CN107830582A (en) * | 2017-12-01 | 2018-03-23 | 珠海市威望节能科技有限公司 | A kind of twin-stage evaporates two-stage condensation heat-pump dehumidification system |
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| CN108585411B (en) * | 2018-04-18 | 2024-04-26 | 广东芬蓝环境科技有限公司 | Sludge drying system based on heat pump technology |
| CN108862995B (en) * | 2018-07-09 | 2021-10-12 | 广州市浩逸环保科技有限公司 | Sludge drying constant temperature device |
| CN108911474A (en) * | 2018-09-10 | 2018-11-30 | 曾思贤 | A kind of belt type sludge low temperature drying equipment using waste heat |
| CN109186235A (en) * | 2018-09-29 | 2019-01-11 | 山东福航新能源环保股份有限公司 | A kind of viscosity object drying unit |
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| CN109592874B (en) * | 2018-11-08 | 2023-11-17 | 天津大学 | Energy-saving sludge drying system |
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| CN109626791B (en) * | 2019-01-30 | 2020-10-27 | 北京中矿环保科技股份有限公司 | Sludge drying equipment and sludge drying method |
| CN109945603A (en) * | 2019-03-22 | 2019-06-28 | 广州市集木蓄能技术开发有限公司 | A kind of enclosed heat pump drying system |
| CN110487058A (en) * | 2019-08-30 | 2019-11-22 | 圣春新能源科技有限公司 | A kind of sludge heat pump drying system |
| CN110698014A (en) * | 2019-11-06 | 2020-01-17 | 重庆大雨水生态科技有限公司 | Harmless treatment process for domestic sludge |
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| CN111578662A (en) * | 2020-04-26 | 2020-08-25 | 上海净泥新能源科技有限公司 | Intelligent recognition type condensation dehumidification mummification system |
| CN112010529A (en) * | 2020-09-16 | 2020-12-01 | 安徽华骐环保科技股份有限公司 | Sludge low-temperature dryer and use method thereof |
| CN113603331B (en) * | 2021-08-03 | 2023-04-25 | 浙江统一联合环境科技有限公司 | Sludge drier with ash removal and anti-blocking functions for mesh belt |
| CN113698063A (en) * | 2021-09-26 | 2021-11-26 | 北京首创生态环保集团股份有限公司 | Heat pump sludge drying equipment |
| CN113929275B (en) * | 2021-10-27 | 2023-10-13 | 中国长江三峡集团有限公司 | Sludge drying system and method based on carbon dioxide stepped serial circulation high-temperature heat pump |
| CN114933404A (en) * | 2022-06-02 | 2022-08-23 | 江苏通用环保集团有限公司 | Multistage energy-saving closed dehumidification heat pump system |
| CN116750942B (en) * | 2023-08-07 | 2024-03-08 | 河北工程大学 | Low-temperature sludge (coal slime) drying process |
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| CN201011479Y (en) * | 2007-02-09 | 2008-01-23 | 王明根 | Solar energy and high-temperature double-heat-source heat pump sludge drying device |
| CN201152668Y (en) * | 2007-10-19 | 2008-11-19 | 西安交通大学 | Drying device for heat pump |
| CN205874188U (en) * | 2016-07-28 | 2017-01-11 | 瑞科际再生能源股份有限公司 | Heat pump dehumidification circulation system |
| CN206033537U (en) * | 2016-07-28 | 2017-03-22 | 瑞科际再生能源股份有限公司 | Heat pump drying system |
| CN206204129U (en) * | 2016-07-28 | 2017-05-31 | 瑞科际再生能源股份有限公司 | Rotary wheel dehumidifying heat pump whirlwind sludge dry system |
| CN106673392A (en) * | 2016-08-30 | 2017-05-17 | 上海东诚环保科技有限公司 | Low-temperature sludge drying technology |
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